Rhombidodecadodecahedron
In geometry, the rhombidodecadodecahedron is a nonconvex uniform polyhedron, indexed as U38. It has 54 faces (30 squares, 12 pentagons and 12 pentagrams), 120 edges and 60 vertices.[1] It is given a Schläfli symbol t0,2{5⁄2,5}, and by the Wythoff construction this polyhedron can also be named a cantellated great dodecahedron.
| Rhombidodecadodecahedron | |
|---|---|
 | |
| Type | Uniform star polyhedron |
| Elements | F = 54, E = 120 V = 60 (χ = −6) |
| Faces by sides | 30{4}+12{5}+12{5/2} |
| Wythoff symbol | 5/2 5 | 2 |
| Symmetry group | Ih, [5,3], *532 |
| Index references | U38, C48, W76 |
| Dual polyhedron | Medial deltoidal hexecontahedron |
| Vertex figure |  4.5/2.4.5 |
| Bowers acronym | Raded |
Cartesian coordinates
Cartesian coordinates for the vertices of a uniform great rhombicosidodecahedron are all the even permutations of
- (±1/τ2, 0, ±τ2)
- (±1, ±1, ±√5)
- (±2, ±1/τ, ±τ)
where τ = (1+√5)/2 is the golden ratio (sometimes written φ).
Related polyhedra
It shares its vertex arrangement with the uniform compounds of 10 or 20 triangular prisms. It additionally shares its edges with the icosidodecadodecahedron (having the pentagonal and pentagrammic faces in common) and the rhombicosahedron (having the square faces in common).
 convex hull |
Rhombidodecadodecahedron |
 Icosidodecadodecahedron |
 Rhombicosahedron |
 Compound of ten triangular prisms |
 Compound of twenty triangular prisms |
Medial deltoidal hexecontahedron
| Medial deltoidal hexecontahedron | |
|---|---|
 | |
| Type | Star polyhedron |
| Face |  |
| Elements | F = 60, E = 120 V = 54 (χ = −6) |
| Symmetry group | Ih, [5,3], *532 |
| Index references | DU38 |
| dual polyhedron | Rhombidodecadodecahedron |
The medial deltoidal hexecontahedron (or midly lanceal ditriacontahedron) is a nonconvex isohedral polyhedron. It is the dual of the rhombidodecadodecahedron. It has 60 intersecting quadrilateral faces.
See also
References
- Maeder, Roman. "38: rhombidodecadodecahedron". MathConsult.
- Wenninger, Magnus (1983), Dual Models, Cambridge University Press, doi:10.1017/CBO9780511569371, ISBN 978-0-521-54325-5, MR 0730208
External links
- Weisstein, Eric W. "Rhombidodecadodecahedron". MathWorld.
- Weisstein, Eric W. "Medial deltoidal hexecontahedron". MathWorld.
- Uniform polyhedra and duals